Ore-screen.



G. O. MIOHAELSEN.

ORE SCREEN.

APPLICATION FILED MAY 20,1911. 1,040,253 1 Patented Oct. 1, 1912.

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G. 0. MICHAELSEN.

ORE SCREEN.

APPLICATION rum) MAY 20,1911.

Patented Oct. I 1912.

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idltATlES PATENT ()FFICE.

CHARLES O. MICHAELSEN, F OMAHA, NEBRASKA.

ORE-SCREEN.

Specification of L tt rs Pa n Patented Oct 1, 1912.

Application filed May 20, 1911. Serial No. 628,574.

Screens, of which the following is a specification.

My. invention relates to screening mechanism, and more particularly toscreens for handling crushed ore and the like especiallyl inwet-processes where the crushed ore is mixedwith a sufficient quantityof water to make it flow.

It is the object of my invention to provide ascreen of this kind havingmeans for causing a uniform distribution of the material over thescreening surface, means for varying the area of the screening surface,and driving means for causing a rotary movement of the screen togetherwith an interrupted,, oscillatory and jarring action thereon.

In the accompanying drawings, Figure 1 is a. longitudinal sectional viewof a screen embodying my invention, Fig. 2 is a side elevation of thesame, Fig. 3 is a transverse section thereof on the plane of the linea2--aa of Fig. 1, Fig. 4 is a detail elevation of the driving-gearinterrupting devices, and Fig. v5.is a detail elevation of the drivinggears showing the resilient gear with the cover-plate removed therefrom.

in carrying out my invention 1. provide cylindrical shells 1 and 2 whichare mounted in axial alinement with each other on a tubular shaft 3. Theadjacent ends of the shells. are open and the remote ends are closed byheads 4 which engage the shaft 3jt0 support said ends of the shellsthereon. Adjoining the open ends of the shells are spiders. 5 which aremounted on the shaft 3 andconnectthe shells therewith. The shell 1 issecured fixedly on the shaft, and the :shell 2 is slidablelongitudinally thereon.

Rods 6 are revolubly mounted in lugs secured on the outside of the shell1, and said rods have threaded end portions 7 which are screwed throughlugs secured on the shell 2. By. turning said rods the shell 2 may bemovedilongitudinally upon the shaft to vary the space between the openends of the shells. Acylindrical'screen 8 fits slidably over the outsideof the shells at the open ends thereof and the ends of said screen areheld upon the shells by means of the clamping-bands 9. The tubular shaft3 is journalcd in bearings 10, 11 and 12 supported in the bearingstandards 13, 14 and 15, said standards being mounted upon a suitablebase 16 placed at a slight incline from a horizontal plane. The bearingstandards 14 and are extended above the bearings for the shaft 3 andcarry at their upper ends suitable bearings for the driving-shaft 17.The shaft 3 is not extended entirely through the-bearing 12, and thefront end portion of said hearing is used to support the feed-hopper 18from which a pipe 19 is extended into the end of the tubular shaft, asshown in Fig. 1. Just inside the head 4 of the shell 1 a number of ports20 are made in the shaft, through which the materials passing throughthe shaft from the feed-hopper may escape into the shell 1. Back of theports 20 a plug 21 is placed to prevent the material passing through theshaft from going beyond the ports. A circular plate 22 is disposedwithinthe shell 1 back of the ports 20 in the shaft so as to form in effect achamber 23 between said plate and the head 4 into which the material isdischarged from the ports. The plate 22 is mounted on the shaft so as tobe slidable longitudinally thereon to vary the size of the chamber 23,and is provided with handles 24 by which it may be moved. The diameterof the plate 22 is such that a narrow annular opening is left betweenthe periphery thereof and the shell, through which opening the materialpasses from the chamber 23 in a thin sheet.

In the shell 2 near the closed end thereof are made a number of ports25, and plates 26 are adjustnbly secured on the shell adjoining saidports so that the width of the ports may be varied thereby. A suitabletrough or chute 27 is disposed below the ports to receive the materialdischarged therefrom, and a similar trough or receiving device 28 isdisposed below the screen 8 to receive the material which passes throughthe same. A ball tlnust-bearing 29 is arranged adjoining the bearing 1.0to receive the end-thrust of the shaft due to the placing of the machinein an inclined position.

011 the driving-shaft 17 is a heavy ilywheel 30 which also serves as apulley which may be connected by belt withn suitable source of power. Agear 31 is carried on the driving shaft and said gear meshes with a gear32 which is mounted yieldably on the shaft 3. The said gear 32 is madein the form of a ring which fits rotat-ably upon a central body or hub33 and between the plates 34 and 35 which are secured to said hub. Onthe inner side of the gear-ring are two or more lugs 36 which extendinto pockets or recesses made in the hub-body as shown in Fig. 5,wherein the cover-plate 35 is removed. Each of said lugs 36 is engagedat one side by a coil spring 37 arranged in the recess, and is normallyheld by said spring in engagement with av block 38 of resilient materialsuch as rubber disposed in the other end of the pocket. The direction ofrotation of the gears is such that the lugs tend to move away from theresilient blocks 38 and to compress the springs 37. When the drivings-haft is moved at-a uniform rate of speed the-geared connection tendsto move the screen-shaft 3 in a like manner and will do so unless therotation thereof is sufliciently resisted to compress the springs 37.If, after the application of such resistance, the same be removed thesprings will then move the shaft more rapidly than the gear 32 until theresilient blocks 38 strike the lugs 36. When such movement is made withsufficient rapidity the momentum of {the parts will also momentarilycompress the resilient blocks so that expansion thereof to their normalthickness will give a second, but shorter, reversing or retarding of themovement of the shaft 3. Automatic means for causing at regularintervals such retardation and acceleration of movement of thescreen-shaft are provided as follows: On the side ofthe gear 31 is aplate 39 which is secured to the gear by screws 40 passing througharcuate slots in the plate so that the relative positions of the plateand gear may be-adjusted. The plate 34 is similarly secured tothe-hub-body 33. On the plate 39 are revolubly mounted rollers 41, andon the the said rollers 41 and 42 moving in interseating paths. Bysuitably adjusting the relation of the plate 39 and gear 31, and therelation of the plate 34 and hub-body 33, said rollers 41 and 42 arecaused to interfere with each other during the rotation of the drivinggears so that the screen-shaft is alternately retarded to compress thesprings 37 and then released so as to permit its movement to beaccelerated by the expansion of the springs. The rollers in .Fig.

4 are shown in the positions assumed at the beginning of the retardingaction.

From the foregoing the operation of the machine will be apparent. Whenin use the screen-cylinder is revolved with an alternately retarded andaccelerated movement which causes a jerking pulsating and scouringaction upon the material passing through the cylinder. The material fromplate 34 are mounted similar rollers 42,,

into the shell near the feed-hopper passing through the tubular shaftand the ports 20 into the chamber 23 is caused by the plate 22 to bedistributed tinues to move along the cylinder and is discharged throughthe ports 25. According to the material operated upon, a greater or lessarea of screen surface may be de sired and this is obtained by varyingthe distance between the open ends of the shells 1 and 2, as described.

The interrupted drive gearing, herein shown and described, isspecifically claimed 1n my application for patent thereon, Serial N o642,216, divided herefrom and filed August 3, 1911.

Now, having described my invention, what I claim cut is:

1. In an ore-screen, a pair of cylindrical shells revolubly mounted inaxial alinement with each other, a cylindrical screen connecting theadjacent ends of the shells, means for varying the distance between theends of the shells, and means for feeding materials into one of theshells.

2. In an ore-screen, a pair of cylindrical .shells, a revoluble inclinedtubular shaft on which the shells are varying the distance between theadjacent ends of the shells, a cylindrical screen fitting slidably onsaid adjacent ends of the shells, and means for feeding materials intothe tubular shaft, there being ports to admit the materials from theshaft into one of the shells, and openings in the other shell formounted, means for the discharge of the materials which pass across thescreen.

3. In an ore-screen,

a tubular shaft, a pair of cylindrical shells mounted on said shaft 'andhaving adjacent open ends and remote closed ends, a screen fittingaround the adj acent ends of the shells, means for feeding .materialinto the tubular shaft, said shaft having ports for discharging suchmaterial into one. of the shells near the closed end thereof, and acircular distributing-plate disposed between said ports and the open endof said shell.

4. In an ore-screen, a revoluble cylindrical shell having a closed endand an open end, a cylindrical screen arranged upon the open end of theshell, means for feeding materials theclosed end thereof, and a circularplate adjustably disposed within the shell and arranged to form betwee"the same and the shell a narrow annular opening through which thematerials must pass in moving toward the screen.

5. In an ore-screen, a pair of cylindrical and desire to securebyLet-ters Pat-' revolubly mounted shells having open adjacent ends,adjusting means for varying the distance between'said open ends of theshells, a cylindricalscreen fitting slidably over the shells andbridging the space between the open ends thereof, means for feedinmaterials into one of the shells, means I01 distributing said materialsbefore the same pass onto the screen, there being discharge ports in theother shell, and means for varying the area of said ports.

6. In an ore screen, a pair of cylindrical shells, a revoluble inclinedtubular shaft on which the shells are mounted, means for varyin thedistance between the adjacent ends 0 the shells, a cylindrical screenfitting slidably on said adjacent ends of the shells, means for feedingmaterials into the tubular shaft, there being orts to admit thematerials from the sha t into one of the shells, and openings in theother shell for the discharge of the materials which pass across thescreen, and means for imparting to the tubular shaft an alternatelyretarded and accelerated rotary movement.

7. In an ore screen, a tubular shaft, a air of cylindrical shellsmounted on said s aft and having adjacent open ends and remote closedends, a screen fitting around the adjacent ends of the shells, means forfeeding materials into the tubular shaft, said shaft having ports fordischarging such materials into one of the shells near the closed endthereof, a circular distributing-plate disposed between said ports andthe open end of the shell, and means for actuating the shells with aninterrupted-rotary movement.

8. In an ore screen, arevoluble cylindrical shell having a closed endand an open end, a cylindrical screen arranged upon the open end of theshell, means for feeding materials into the shell near the closed endthereof, a circular plate adj ustably disposed within the shell andarranged to form between the same and the shell a narrow annular openingthrough which the materials must pass in moving toward the screen, andactuating means connected with the shell and adapted to revolve the sameinterruptedly.

9. In an ore screen, a pair'of cylindrical revolubly mounted shellshaving open adj acent ends, adjusting means for varying the distancebetween said open ends of the shells, a cylindrical screen fittingslidably over the shells and bridging the s ace between the open endsthereof, means or feedin mate- 'rials into one of the shells, means fordistributing said materials before the same pass onto the screen, therebeing discharge ports in the other shell, means for varying the area ofsaid ports, and actuating means connected with the shells and adapted torevolve the same interruptedly.

In testimony whereof I have hereunto subscribed my name in the presenceof two witnesses. Y

CHARLES O. MICHAELSEN. Witnesses:

D. O. BABNELL, J. E. Trrus.

